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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/DDD266EF-CE4D-4801-909D-E898263F8324 | - |
| Identifier | https://doi.org/10.1016/j.porgcoat.2012.10.006 | - |
| Language | en | - |
| Extent | 11 pages | en |
| Title | TiO2–SiO2–PDMS nano-composite hydrophobic coating with self-cleaning properties for marble protection | en |
| Creator | Maravelaki Pagona | en |
| Creator | Μαραβελακη Παγωνα | el |
| Creator | Kapridaki Chrysi | en |
| Creator | Καπριδακη Χρυση | el |
| Publisher | Elsevier | en |
| Content Summary | This research work presents the design of a transparent-hydrophobic hybrid semi-crystalline SiO2–TiO2 coating and its application in the field of monument conservation. The SiO2–TiO2 coating derived from a mixture of tetraethoxysilane (TEOS) and titanium-tetra-isopropoxide (TTIP) incorporating an organosilane, the hydroxyl-terminated polydimethylsiloxane (PDMS). The complete hydrolysis of TEOS was achieved by oxalic acid, which also controlled the gel drying. XRD, DTA–TG, FT-IR and SEM analyses evaluated the designed coating, which is transparent, crack-free with a crystallite size of 5 nm. The evolution of the hydrolysis of TEOS, as well as the copolymerization of TEOS, TiO2 and PDMS as a function of time were assessed by FT-IR analysis. The effectiveness of TiO2–SiO2–PDMS nano-composite as hydrophobic coating was investigated by capillary water absorption and static contact angle measurements. The SEM analysis of the treated sample revealed a homogeneous crack-free coating on marble, while FT-IR proved that condensation and copolymerization reactions took place on the marble surface. The removal of both methylene blue stains and biofilm on treated samples support the self-cleaning properties of the designed coating. The total color differences and the decrease of the water vapor permeability range within acceptable limits. After treatment, a decrease in the water capillary coefficient and an increase in the contact angle were observed. The innovation of this synthesis pertains to the application of a hydrophobic transparent nano-composite based on SiO2–TiO2 with self-cleaning properties, without modifying the color of the marble surface and the water vapor permeability. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2015-11-03 | - |
| Date of Publication | 2013 | - |
| Subject | Monuments--Preservation | en |
| Subject | monuments conservation and restoration | en |
| Subject | monuments preservation | en |
| Bibliographic Citation | C. Kapridaki, and P. Maravelaki-Kalaitzaki, "TiO2–SiO2–PDMS nano-composite hydrophobic coating with self-cleaning properties for marble protection", Prog. Orga. Coat., vol. 76, no. 2-3, pp. 400–410, Feb. 2013. doi:10.1016/j.porgcoat.2012.10.006 | en |
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